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while the owner manual does not specify the length etc of bolts it does show there are 4 of them---look like find thread machine bolt---may be able to buy a few at the hardware sore or Home Depot---if the threads are inside the base take it with you as a guide.

You need to use GOOD WALL BRACKETS which can hold the weight of the TV.
Also the mounting on the wall must be firm with good foundation tower bolts.
please check on the links below for some tips and ideas on wall brackets.:

If you are talking about the mounting screws that go into the back of the television to mount a VESA sized wall bracket, then it's most likely 5mm screws. The length of the screws could differ, depending on the bracket you are attaching, but usually 12mm or 16mm can be used. just make sure that the screws are long enough to thread into the TV completely, but not too long, or they may damage internal components.

If you are talking about the Lag screws needed to mount the bracket to the wall, then use 3/8" width lag screws 2 1/2" to 3 1/2" long, depending on how deep you have to go before hitting the wood stud.

M8 - according to a document I found online for a Toshiba mounting bracket kit for their LCD TVs the bolt size is M8. It should be easily available in a large hardware store or place that sells large flat screens.
Make sure you hand tighten it into the mounting hole before attaching any brackets, to judge the proper depth for tightening. Over-tightening with a long bolt could damage the TV.

There is no such bolt size as 4.5mm, if you look in to an imperial size bolt instead you will find that the imperial size converts back to 4mm or 5mm (M4 or M5 and nothing in the middle).
Samsung can not advise on the correct bolt for your tv model as they do not have the specification for this, this is a factory error - no other Samsung model hase this problem.
You can use PTFE tape, wrap this around the M4 bolt to give it .5mm, PTFE tape is used by plumbers to make screw threads water tight when using compression fittings.You can buy PTFE tape from any DIY store.
I have a samsung LE model, 32", I bought a TV wall bracket from an excellent website called http://www.mountright.com , they supplied with a UMount TV bracket which came with all the correct bolts for my Samsung TV.